4623e8e6ac
This adds support for discovering and making use of properly tagged dm-verity data integrity partitions. This extends both systemd-nspawn and systemd-dissect with a new --root-hash= switch that takes the root hash to use for the root partition, and is otherwise fully automatic. Verity partitions are discovered automatically by GPT table type UUIDs, as listed in https://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ (which I updated prior to this change, to include new UUIDs for this purpose. mkosi with https://github.com/systemd/mkosi/pull/39 applied may generate images that carry the necessary integrity data. With that PR and this commit, the following simply lines suffice to boot up an integrity-protected container image: ``` # mkdir test # cd test # mkosi --verity # systemd-nspawn -i ./image.raw -bn ``` Note that mkosi writes the image file to "image.raw" next to a a file "image.roothash" that contains the root hash. systemd-nspawn will look for that file and use it if it exists, in case --root-hash= is not specified explicitly.
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <stdio.h>
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#include "dissect-image.h"
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#include "log.h"
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#include "loop-util.h"
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#include "string-util.h"
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int main(int argc, char *argv[]) {
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_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
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_cleanup_(dissected_image_unrefp) DissectedImage *m = NULL;
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int r, i;
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log_set_max_level(LOG_DEBUG);
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if (argc < 2) {
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log_error("Requires one command line argument.");
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return EXIT_FAILURE;
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}
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r = loop_device_make_by_path(argv[1], O_RDONLY, &d);
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if (r < 0) {
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log_error_errno(r, "Failed to set up loopback device: %m");
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return EXIT_FAILURE;
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}
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r = dissect_image(d->fd, NULL, 0, &m);
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if (r < 0) {
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log_error_errno(r, "Failed to dissect image: %m");
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return EXIT_FAILURE;
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}
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for (i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) {
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if (!m->partitions[i].found)
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continue;
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printf("Found %s partition, %s of type %s at #%i (%s)\n",
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partition_designator_to_string(i),
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m->partitions[i].rw ? "writable" : "read-only",
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strna(m->partitions[i].fstype),
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m->partitions[i].partno,
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strna(m->partitions[i].node));
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}
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return EXIT_SUCCESS;
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}
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